Thus Ductile iron valves can easily replace cast iron or steel valves.
因此球墨铸铁阀门能够方便的替换铸铁或钢阀门。
Steel in this class is tough, ductile and easily machined.
这种钢强韧，延展性好，而且容易加工。
Steel and ductile iron construction.
钢和球墨铸铁建设。
Gray cast iron, ductile iron, carbon steel.
灰铸铁，球墨铸铁，碳钢。
Gray cast iron, ductile iron, carbon steel.
灰铸铁，球墨铸铁，碳钢。
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